TITUSVILLE — Police said four people killed in Monday's crash were a family vacationing from Bristol, England.

Investigators believe the Stephenson family had just left Kennedy Space Center and were traveling to a rental house in Davenport in Polk County, police spokeswoman Amy Matthews said. That's based on the global-positioning system device discovered in their rented white Mitsubishi sedan, Matthews said.

Adam P. Stephenson, 30, of Bristol was driving the Mitsubishi west on State Road 405 about 6 p.m. Monday, police said. He made a left turn on Sisson Road into the path of an eastbound black Ford F-250 pickup. The pickup struck the passenger side of the rental car, police said.

Other motorists stopped at the scene to check on the family in the wrecked rental car and to call 911, according to Titusville police dispatch records. The callers told dispatchers they were not detecting pulses on the people in the Mitsubishi, according to the dispatch notes.

The collision killed Adam P. Stephenson and his relatives: Maryanne Stephenson, 29, Brian Stephenson, 66, and Sheralyn T. Stephenson, 56, police said. They were all pronounced dead at the scene.

The pickup driver, James D. Walsh II, 28, of Port St. John, was treated for non life-threatening injuries at a hospital, police said.

The GPS device in the rental indicated the family was being re-routed away from an earlier crash on SR 407.

Police are investigating the crash in Titusville that killed four family members visiting from Bristol, England.(Photo: CONTRIBUTED PHOTO BY TITUSVILLE POLICE DEPARTMENT)

The afternoon of heavy traffic in the Titusville area could be credited to the SpaceX Falcon 9 launch to the International Space Station.

One member of the family remained in Davenport Monday and did not make the trip to Brevard County with his family, according to Titusville dispatch records and the Polk County Sheriff's Office.

A Polk sheriff's lieutenant made contact with the 33-year-old man late Monday night to deliver the news about the traffic crash, the Sheriff's Office said.

Lamaur Stancil is a breaking news reporter for Florida Today and TCPalm.com. He can be reached at 321-242-3662 or 321-987-7179. E-mail him at lamaur.stancil@tcpalm.com. Follow him on Twitter at @TCPalmLStancil.